Reck K B, Jost-Brinkmann P G, Toll D E
Poliklinik Nord der FU Berlin.
Prakt Kieferorthop. 1991 Nov;5(4):303-8.
This case report presents a patient with extremely delayed mineralisation of a first upper right premolar and simultaneously congenitally missing second premolars. While the germs of the first premolars are usually detectable on dental X-ray films at the age of three or four years, the demonstrated patient was older than 13 years when the first premolar became visible. As the right first bicuspid actively erupted normal root growth took place, and once the tooth is in its normal position its anatomy can be considered normal. With the eruption of the permanent tooth the periodontal situation improved considerably in the region where depression of its predecessor had taken place. As a practical clinical consequence one should take into consideration that mineralisation of a first premolar can be extremely delayed in cases with congenitally missing second premolar teeth.
本病例报告介绍了一名右上第一前磨牙矿化极度延迟且同时先天性缺失第二前磨牙的患者。虽然第一前磨牙的牙胚通常在三四岁时就能在牙科X光片上检测到，但该患者直到13岁以上第一前磨牙才可见。随着右侧第一双尖牙的主动萌出，牙根正常生长，一旦牙齿处于正常位置，其解剖结构可视为正常。随着恒牙的萌出，其前身所在区域的牙周状况有了显著改善。作为实际临床结果，应考虑到在先天性缺失第二前磨牙的情况下，第一前磨牙的矿化可能会极度延迟。
